I have a multiplayer problem with 2 cam for each player

Hi to all, i'm italian sorry for bad english, i am trying to make a multiplayer game with unity, i follow this guide and i have added 2 cams for each cube player, with network and this script:

 #pragma strict
 var cam1 : Camera;
 function Start (){
  
     if(networkView.isMine){
        cam1.enabled = true;
     }
     else{
        cam1.enabled = false;
     }
 }

i have tried also to make 2 player prefabs, one for each player,but nothing, when i connect i see my friend's camera and he see the mine... Please help, what i have to do?